JP5321233B2 - Temperature detector and hydrogen filling system with temperature detector - Google Patents

Description

  The present invention relates to a temperature detector and a hydrogen filling system including the temperature detector.

  A temperature sensor having a sensor element for detecting temperature is accommodated in a temperature-detectable housing to cover the sensor element, for example, in an environment where the sensor element may be deteriorated in an exposed state. A brazing process is then performed to seal the opening of the housing.

  On the other hand, in Patent Document 1, in order to prevent a welding failure of a protective tube that houses a sensor element in a temperature sensor, an open end of the protective tube is inserted into a support tube having a diameter larger than that of the protective tube, and a thick support tube is provided. It has been proposed to weld the thick support tube and the welded cylindrical portion of the thick housing after brazing one end of the tube and the outer periphery of the protective tube.

  Patent Document 2 proposes a temperature detector that performs temperature measurement by calibrating a resistance value at a predetermined temperature of an element such as a thermistor based on a reference resistance value.

JP 2005-283425 A JP-A-7-55588

  By the way, a void may occur in the brazed portion formed by the brazing process described above. However, a void that normally communicates between the internal space of the housing in which the temperature sensor is accommodated and the external atmosphere of the housing does not occur, but sometimes the communication void that communicates between the internal space of the housing and the outside of the housing. May occur, and in such a case, the sensor element of the temperature sensor may be deteriorated.

  The present invention has been made in view of the above problems, and even if a communication void is generated in a brazed portion of a certain temperature sensor and the sensor element deteriorates, the output of the deteriorated sensor element is corrected to obtain a highly accurate temperature. A temperature detector enabling measurement and a hydrogen filling system including the temperature detector are provided.

  In order to achieve the above object, the temperature detector of the present invention and the hydrogen filling system including the temperature detector have the following characteristics.

(1) A first temperature sensor provided in a hydrogen atmosphere and provided with a sensor element for detecting temperature in a brazed and sealed space, and a metal part having an exposed surface inside and outside the hydrogen atmosphere, respectively And a second temperature sensor provided outside the hydrogen atmosphere and attached to the metal part, and a correction means for correcting the output of the first temperature sensor based on the output of the second temperature sensor. It is a detector.

Even if a communication void occurs in the brazed part of the temperature sensor in the hydrogen atmosphere and the sensor element deteriorates, the sensor element that deteriorates in the hydrogen atmosphere based on the output of the temperature sensor outside the hydrogen atmosphere that does not easily deteriorate. The output is corrected and high-precision temperature measurement is performed. Further, by providing the second temperature sensor in the exposed metal part of the tank, the temperature detection closer to the internal temperature of the tank can be performed by the second temperature sensor. As a result, the sensor in the first temperature sensor Even if the element deteriorates, it can be corrected based on the output of the second temperature sensor, and highly accurate temperature detection can be maintained.

(2) at a temperature detector according to the above (1), the sensor element is a sensor element whose resistance value varies with temperature, the correction means, based on the detected temperature of the second temperature sensor, the A temperature detector for correcting a resistance value of a sensor element of a first temperature sensor.

  If the sensor element has its characteristics changed by a reducing action, if the sensor element of the temperature sensor in the hydrogen atmosphere is exposed to hydrogen and reduced, the resistance value of the sensor element increases, and as a result, detection The temperature is output lower than the actual temperature. Therefore, it is possible to provide a temperature detector capable of highly accurate temperature measurement by correcting the resistance value of the sensor element of the first temperature sensor based on the temperature detected by the temperature sensor outside the hydrogen atmosphere.

  (3) A hydrogen filling system including the temperature detector according to (1) or (2).

  For example, when the tank is filled with hydrogen at a high pressure, the tank can be filled with hydrogen while accurately controlling the hydrogen filling pressure with the internal temperature of the tank equal to or lower than a preset upper limit temperature.

(4) At least one or more tanks for hydrogen filling, metal parts having exposed surfaces inside and outside the tank, and sensor elements for detecting temperature are brazed. together provided in a hermetically sealed space and the first temperature sensor provided at least one in said tank, arranged outside the tank, a second temperature sensor attached to the metal part, the second and correcting means for correcting the output of the first temperature sensor based on the output of the temperature sensor, a hydrogen filling system comprising.

Even if a communication void occurs in the brazed portion of the first temperature sensor in the tank and the sensor element deteriorates, the deterioration in the tank is based on the output of the second temperature sensor outside the tank, which is unlikely to deteriorate. When the output of the sensor element is corrected and the tank is filled with hydrogen at a high pressure, the tank can be filled with hydrogen while accurately controlling the hydrogen filling pressure below the preset upper limit temperature. Further, by providing the second temperature sensor in the exposed metal part of the tank, the temperature detection closer to the internal temperature of the tank can be performed by the second temperature sensor. As a result, the sensor in the first temperature sensor Even if the element deteriorates, it can be corrected based on the output of the second temperature sensor, and highly accurate temperature detection can be maintained.

  According to the present invention, for example, even if a communication void is generated in a brazed portion of a temperature sensor in a hydrogen atmosphere and the sensor element is deteriorated, the output of the deteriorated sensor element is corrected and temperature measurement with high accuracy can be performed. .

It is a block diagram which shows the outline of the hydrogen filling system which is one Embodiment in this invention. It is a block diagram which shows the outline of the hydrogen filling system which is other embodiment in this invention. It is an expansion schematic sectional drawing of the A part enclosed with the broken line of FIG. It is a figure for demonstrating the void which generate | occur | produces in a brazing part using the cross section along the II line | wire of FIG. It is a figure for demonstrating an example of the structure of the brazing part in this invention. It is a figure for demonstrating the other example of the structure of the brazing part in this invention. It is a figure for demonstrating the other example of the structure of the brazing part in this invention. FIG. 8 is a cross-sectional view taken along the line II-II in FIG. 7. It is a figure for demonstrating the other example of the structure of the brazing part in this invention. It is a figure for demonstrating an example of correction | amendment of the correction | amendment means in this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a hydrogen filling system according to an embodiment of the present invention includes a tank 10 having a pressure-resistant structure for hydrogen filling, and a valve 12 having a gas flow path for filling the tank 10 with hydrogen. , A regulator 14 for controlling the gas pressure flowing through the valve 12, a receptacle 16 connectable with a plug for filling hydrogen, a first temperature sensor 100 attached to the valve 12 in the tank 10, and the tank 10 The gas temperature of the regulator 14 is controlled on the basis of the second temperature sensor 110 provided outside and the measured temperature output from the first temperature sensor 100, and the second temperature sensor 110 is controlled based on the output of the second temperature sensor 110. And a control unit 30 that includes a correction unit that corrects the output of one temperature sensor 100.

  In the first embodiment, the second temperature sensor 110 is provided in the valve 12 that is one of the exposed metal portions of the tank 10, and the output of the second temperature sensor 110 is transmitted to the control unit 30. Thereby, temperature detection closer to the internal temperature of the tank 10 can be performed by the second temperature sensor 110. As a result, even if the sensor element in the first temperature sensor 100 deteriorates as will be described later, it is possible to correct the temperature based on the output of the second temperature sensor 110 and maintain highly accurate temperature detection.

As shown in FIG. 2, a hydrogen filling system according to another embodiment of the present invention includes a tank 10 having a pressure-resistant structure for filling hydrogen, and a valve 12 having a gas flow path for filling the tank 10 with hydrogen. A regulator 14 for controlling the gas pressure flowing through the valve 12, a receptacle 16 connectable with a plug for filling hydrogen, a first temperature sensor 100 attached to a base 18 in the tank 10, and a tank 10, a second temperature sensor 110 provided outside 10, and a gas pressure of the regulator 14 based on the measured temperature output from the temperature sensor 100 and a first temperature based on the output of the second temperature sensor 110. And a control unit 30 that includes a correction unit that corrects the output of the temperature sensor 100.

  In the second embodiment, the second temperature sensor 110 is provided in the base 18 that is one of the exposed metal portions of the tank 10, and the output of the second temperature sensor 110 is transmitted to the control unit 30. Thereby, temperature detection closer to the internal temperature of the tank 10 can be performed by the second temperature sensor 110. As a result, even if the sensor element in the first temperature sensor 100 deteriorates as will be described later, it is possible to correct the temperature based on the output of the second temperature sensor 110 and maintain highly accurate temperature detection.

  In the first and second embodiments described above, the first temperature sensor 100 provided in the tank 10 includes a housing 22 made of a material having thermal conductivity, a housing, as shown in FIG. 22 includes a temperature detecting sensor element 20 provided in the space 22 and a lid 24 for sealing the opening of the housing 22 via a brazing portion 40. The output from the sensor element 20 is transmitted to the control unit 30 shown in FIGS. 1 and 2 through a signal line not shown in FIG. Here, for example, a metal material can be used for the housing 22.

  As the brazing material for forming the brazing portion 40, an alloy (brazing) having a melting point lower than that of the metal used for the housing 22 and the lid 24, which are members to be joined (base material), is used, for example, silver, copper, zinc Silver brazing based on copper, copper brazing based on copper and zinc, brass brazing, copper copper brazing based on 5% to 8% phosphorus, aluminum brazing, gold brazing, etc. it can. In addition, some silver solders have cadmium and nickel added.

  In some cases, a void 50 is generated in the brazed portion 40 formed by the brazing process, as shown in FIG. 4, but normally, the internal space of the housing in which the temperature sensor is accommodated and the housing There are no voids that communicate with the outside atmosphere. However, a communication void 52 may be formed in the brazed portion 40 so that the internal space of the housing communicates with the outside of the housing. In such a case, the sensor element of the temperature sensor may be deteriorated. The void 50 and the communication void 52 can be observed with X-rays.

  Here, the sensor element in the first temperature sensor 100 provided in the tank 10 shown in FIGS. 1 and 2 is a sensor element whose resistance value changes depending on the temperature, and its characteristic changes due to the reducing action. In some cases, when the sensor element is exposed to hydrogen and reduced, the resistance value of the sensor element increases, and as a result, the detected temperature is output lower than the actual temperature.

  Therefore, in the hydrogen filling systems in the first and second embodiments, the correction means in the control unit 30 uses the first temperature sensor 110 provided outside the tank 10 to correct the first. The resistance value of the sensor element of the temperature sensor 100 is corrected, so that temperature measurement can be performed with high accuracy. As a result, when filling the tank 10 with hydrogen at a high pressure, the tank 10 can be filled with hydrogen while accurately controlling the hydrogen filling pressure below the preset upper limit temperature.

  The correction means in the control unit 30 according to the first and second embodiments uses the relationship between the measured temperature and the resistance value as shown in an example in FIG. 10 in a state where the temperature is stable at the time of startup or the like. The resistance value of the sensor element of the first temperature sensor 100 reduced in the tank 10 indicated by the solid line is based on the detected temperature of the second temperature sensor 110 provided outside the tank 10 indicated by the chain line. By correcting the resistance value of the sensor element reduced in the tank 10 and correcting the output of the first temperature sensor 100 provided in the tank 10, it is possible to detect a more accurate internal temperature of the tank 10. I have to.

  Further, as shown in FIGS. 1 to 3, the temperature detector in the present embodiment is provided in a hydrogen atmosphere and includes a sensor element 20 for detecting temperature in a brazed and sealed space. In the control unit 30, the output of the first temperature sensor 100 is corrected based on the output of the first temperature sensor 100, the second temperature sensor 110 provided outside the hydrogen atmosphere, and the output of the second temperature sensor 110. And provided correcting means.

  Further, as described above, when the sensor element of the first temperature sensor 100 is a sensor element whose resistance value varies depending on the temperature, the correction means in the control unit 30 includes the second temperature provided outside the tank 10. The resistance value of the sensor element of the first temperature sensor 100 is corrected based on the temperature detected by the sensor 110.

  Further, the brazing unit 40 in the first embodiment and the second embodiment can reduce the generation of communication voids during the brazing process using the brazing sheet shown below.

  First, as a first example of the brazing sheet, as shown in FIG. 5, the first brazing sheet 41 having a size covering the entire opening end of the housing and a width narrower than the thickness width of the opening end of the housing. The first brazing sheet 41 and the second brazing sheet 42 having different widths are stacked using the second brazing sheet 42, and the joint surface between the double portion of the brazing sheet and the housing and the lid As shown by the white arrow in FIG. 5, the void is moved in the direction of the internal space of the housing 22 or the external direction, and the brazing process is performed. Thereby, formation of a communication void in a brazing part is suppressed.

  As a second example of the brazing sheet, as shown in FIG. 6, the brazing sheet 43 is provided with a gradient in thickness, for example, from the central portion corresponding to the internal space of the housing 22 to the outside of the housing. As it goes, the thickness is getting thinner. Therefore, the pressure on the joint surface between the brazing sheet 43 and the housing 22 and the lid 24 increases most on the side close to the internal space where the sensor element 20 is provided, and the pressure on the joint surface increases toward the outside of the housing 22. As a result, as shown by the white arrow in FIG. 6, the void is moved toward the outside of the housing 22 to perform the brazing process. Thereby, formation of a communication void in a brazing part is suppressed.

  Further, as a third example of the brazing sheet, as shown in FIGS. 7 and 8, a ring-shaped brazing sheet 44 having a substantially circular cross section is used. The ring-shaped groove 26 is formed, the ring-shaped brazing sheet 44 is attached to the substantially semicircular groove 26, and the brazing sheet 44 is bonded to the housing 22 and the lid 24. Surface pressure is greatest at the bottom of the groove 26. As a result, as shown by the white arrow in FIG. 7, the void is moved in the direction of the internal space of the housing 22 or the external direction, and the brazing process is performed. Thereby, formation of a communication void in a brazing part is suppressed.

  Further, as shown in FIG. 9, a lid 28 having an outer periphery smaller than the outer periphery of the open end of the housing 22 is used, and a step portion is provided on the housing 22 and the lid 28. The brazing portion 45 formed by brazing the housing 22 and the lid 28 is formed on the outer periphery of the open end of the housing 22 by the brazing flow as shown by a portion X surrounded by a broken line in FIG. Is done. Thereby, in the brazing part 45, formation of a communication void is suppressed.

  The present invention can be used in a temperature detector under a high-pressure hydrogen environment and in a field including the temperature detector, but can also be used in, for example, a vehicle equipped with a fuel cell.

  10 Tank, 12 Valve, 14 Regulator, 16 Receptacle, 20 Sensor element, 22 Housing, 24, 28 Lid, 26 Groove, 30 Control part, 40, 45 Brazing part, 41, 42, 43, 44 Brazing sheet, 50 Void, 52 communicating void, 100 first temperature sensor, 110 second temperature sensor.

Claims (4)

A first temperature sensor provided in a hydrogen atmosphere and having a sensor element for detecting temperature in a brazed and sealed space;
Metal parts each having an exposed surface inside and outside the hydrogen atmosphere;
A second temperature sensor provided outside the hydrogen atmosphere and attached to the metal part ;
And a correction means for correcting the output of the first temperature sensor based on the output of the second temperature sensor. The temperature detector according to claim 1.
The sensor element is a sensor element whose resistance value varies with temperature,
The correction means, based on the detected temperature of the second temperature sensor, the temperature detector and corrects the resistance value of the sensor element of the first temperature sensor.   A hydrogen filling system comprising the temperature detector according to claim 1. At least one tank for filling hydrogen;
Metal parts provided in the tank, each having an exposed surface inside and outside the tank,
A first temperature sensor provided with at least one sensor element for detecting temperature in a brazed and sealed space and provided in the tank;
A second temperature sensor provided outside the tank and attached to the metal part ;
Hydrogen charging system characterized in that it comprises a correction means for correcting the output of the first temperature sensor output based on the second temperature sensor.

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